Chris, have you seen my Thread?
Our springs approximate the XRay springs very much, except they fit much better on the AE shock.
The Xray C2.8 springs are 16 lb springs and the C2.6 are 14.82 lb springs. With the long links it is just about perfect. With shorter links, like I run on our vertical-stud bulkheads, I went slightly softer to a 13.5lb rear and a 15.5lb front spring.
Give the A3 a shot, you'll find that you don't need to re-tighten the arms after every run anymore. Good place to start on the outside is with 4mm underneath the outside stud in the rear and 2mm in the front, with the extra long links (7 hole).